Aquarium heater



FIG. 1 is a side view of the aquarium heater of the present invention.

FIG. 2 is a top view of the present invention.

FIG. 3 is a view of the side of the present invention opposite that shown in FIG. 1.

FIG. 4 is a rear view of the present invention.

FIG. 5 is a front view of the present invention; and,

FIG. 6 is a bottom view of the present invention. 

The ornamental design for an aquarium heater, as shown and described. 